How to define x and y as functions of time?
I would like to use Geogebra (graphing calculator or Classic I suppose) to help students visualize constant acceleration motion in physics, for example projectile motion in constant gravity. We want to define position components x(t) and y(t) as functions, and plot them with respect to time t.
We would define constant values for initial position and velocity x_0, v_x, y_0, v_y0, and constant acceleration a_y=-9.81.
Then we would define functions x(t), y(t), v_y(t) using these constants, and graph x vs. t, y vs. t, v_y vs t.
Unfortunately when I try to name a function "x" by typing
x(t) = x_0 + v_x*t
I get "eq1 undefined"
A function named "x_p(t)" works, but deviating from a well-established convention is undesirable.
is there a way to do what I am after?